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Preparation method and application of Ag nanosheet SERS substrate packed on aluminum foil

A nanosheet and aluminum foil technology is applied in the field of preparation of Ag nanosheets as SERS substrates, which can solve the problems of poor structural uniformity, inconvenience, and dispersion of Ag nanostructures, and achieve the effects of convenient use and storage, firm structure, and easy availability of raw materials.

Active Publication Date: 2020-06-02
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fast reaction rate, the uniformity of its structure is poor, and the interaction between the silver branches and the metal substrate is weak, and the silver branches are easy to fall off from the metal substrate.
This brings great inconvenience to its application in SERS
In addition, for aluminum foil, even in solution, a layer of aluminum oxide film will be formed quickly on its surface, which will prevent further Galvanic substitution reaction between aluminum and silver salt, so the finally obtained Ag nanostructure is dispersed. and uneven

Method used

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  • Preparation method and application of Ag nanosheet SERS substrate packed on aluminum foil
  • Preparation method and application of Ag nanosheet SERS substrate packed on aluminum foil
  • Preparation method and application of Ag nanosheet SERS substrate packed on aluminum foil

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preparation example Construction

[0031] Specifically, the preparation method of the SERS substrate may include the following embodiments:

[0032] Step (1) The aluminum foil is of any size, flattened and polished off the oxide layer on the surface of the aluminum foil with 1000-300 mesh sandpaper; then ultrasonicated with ethanol and water for 3 minutes, rinsed with a large amount of water, and dried with nitrogen gas for later use.

[0033] Step (2) Add NaF containing 30mM and HNO in the glass container 3 15mM mixed solution, the clean Al foil was immersed in the above mixed solution for 1min.

[0034] The mixed solution described in step (3) contains AgNO 3 20-40mM and 3mM sodium citrate, AgNO 3 The reaction time with aluminum foil is 15-60 minutes.

Embodiment 1

[0037] A preparation method for an assembled Ag nanosheet SERS substrate on an aluminum foil, comprising the following steps:

[0038] (1) Use 500-mesh sandpaper to polish and remove the aluminum oxide film on the surface of the aluminum foil, ultrasonically in ethanol and water respectively, rinse with a large amount of water, and blow dry with nitrogen;

[0039] (2) Add 0.8mL of 30mM NaF and 15mM dilute HNO to a glass container 3 Immerse the clean Al foil in the above mixed solution for 1min.

[0040] (3) 1.7ml containing 30mMAgNO 3 and the mixed solution of 3mM sodium citrate are quickly added to the mixed solution described in step (2), so that AgNO 3 React with aluminum foil, the reaction time is 15, 30 and 60min.

[0041] (4) Rinse the aluminum foil covered by the Ag nanosheets prepared in step (3) with a large amount of water, and then immerse them in 4-mercaptopyridine (10 -6 M) in the aqueous solution for 2h, rinse with a large amount of water and blow dry with ni...

Embodiment 2

[0043] A preparation method for an assembled Ag nanosheet SERS substrate on an aluminum foil, comprising the following steps:

[0044] (1) Use 500-mesh sandpaper to polish and remove the aluminum oxide film on the surface of the aluminum foil, ultrasonically in ethanol and water respectively, rinse with a large amount of water, and blow dry with nitrogen;

[0045] (2) Add 0.8mL of 30mM NaF and 15mM dilute HNO to a glass container3 Immerse the clean Al foil in the above mixed solution for 1 min.

[0046] (3) 1.7ml containing 20mMAgNO 3 and the mixed solution of 3mM sodium citrate are quickly added to the mixed solution described in step (2), so that AgNO 3 React with aluminum foil, the reaction time is 30min.

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Abstract

The invention discloses a preparation method and application of an Ag nanosheet SERS substrate packed on aluminum foil. Firstly, the aluminum foil with a clean and coarse surface is prepared, then thealuminum foil is placed in a mixed solution of NaF and HNO3, aluminum trioxide on the surface of the aluminum foil is etched away, finally, AgNO3 and sodium citrate are added to the mixed solution ofthe NaF and the HNO3, and after a reaction lasts for a period of time, an Ag nanosheet packed on the aluminum foil is prepared. The Ag nanosheet is soaked in an ethanol solution of 4-mercaptopyridine, an SERS performance test carries out after the Ag nanosheet is washed and dried, and a result of the test shows that when the 4-mercaptopyridine is 10<-6> M, enforcement ability is still good. The packing density of the Ag nanosheet can be adjusted through control over reaction conditions, so that the enforcement ability of the Ag nanosheet as the SERS substrate is adjusted.

Description

technical field [0001] The invention relates to the field of surface-enhanced Raman scattering (SERS) substrate materials, in particular to a preparation method and application of Ag nanosheets assembled on aluminum foil as a SERS substrate. [0002] technical background [0003] SERS spectroscopy is a highly sensitive, high-resolution analytical technique. A key feature of highly sensitive SERS substrates is the presence of sufficient "hot spots" generated by inter-nanoparticle electromagnetic fields around or in close proximity to large-curvature metallic nanostructures. Therefore, the existence of a large number of "hot spots" endows the SERS substrate with excellent reinforcement performance. When the target molecule is located in the "hot spot" region of the noble metal nanoparticle, its Raman signal can be enhanced by several orders of magnitude. This enables the SERS substrate with excellent enhancement properties to detect trace analytes at extremely low concentrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/42B82Y30/00B82Y40/00G01N21/65
CPCC23C18/42B82Y40/00B82Y30/00G01N21/658
Inventor 王春旭汪玉海宋明星张永玲王佳秦政坤
Owner JILIN NORMAL UNIV
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